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Late Pleistocene Paleoclimates of North America as Inferred from Stable Isotope Studies of Speleothems1

Published online by Cambridge University Press:  20 January 2017

Russell S. Harmon ,
Peter Thompson ,
Henry P. Schwarcz  and
Derek C. Ford
Russell S. Harmon
Affiliation:
Department of Geology, Michigan State University, East Lansing, Michigan 48824 USA
Peter Thompson
Affiliation:
Department of Physics, University of Alberta, Edmonton, Alberta, Canada
Henry P. Schwarcz
Affiliation:
Department of Geology and Geography, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
Derek C. Ford
Affiliation:
Department of Geography, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
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Abstract

Some speleothems (CaCO3 cave deposits) can be demonstrated to have been formed in oxygen isotopic equilibrium with their parent seepage waters and thus a record of relative fluctuations in depositional temperature can be obtained from the δ18O variations in successive growth layers of such deposits. These temperature fluctuations reflect variations in the average annual air temperature at the surface above the cave, and therefore permit inference of past continental climate changes. Equilibrium deposits have been obtained from caves in San Luis Potosi, Bermuda, Kentucky, West Virginia, Iowa, and Alberta, ranging in age from 200,000 years BP to the present, as determined by 230Th/234U dating of the speleothems. The δ18O time curves for the six sites show the following synchronous climatic fluctuations: warm periods from 190 to 165 and from 120 to 100 Ka, at 60 and 10 Ka, and cold periods from 95 to 65 and from 55 to 20 Ka. The periods of thermal maxima correspond in time to the interglacial periods of the marine foraminiferal isotopic and faunal temperature records and to periods of high sea stand as observed from radiometric dating of raised coral reefs. Maxima and minima in insolation appear to be synchronous with this record as well.

Type
Original Articles
Information
Quaternary Research , Volume 9 , Issue 1 , January 1978 , pp. 54 - 70
Copyright
University of Washington

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Footnotes

1

Cave Research Foundation.

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